A DESCRIPTION OF THE PROBLEM :
In the section "Providing a Custom Renderer" is a link to CustomComboBoxDemo.java. The problem is that the link actually points to ComboBoxDemo2.java.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I expected a correct link to CustomComboBoxDemo.java.
ACTUAL -
The link in the documentation actually points to ComboBoxDemo2.java.

URL OF FAULTY DOCUMENTATION :
http://java.sun.com/docs/books/tutorial/uiswing/components/combobox.html